i usually go to G&C in chantilly. you can buy this car care club card for $80 and you get 4 oil changes and some other coupons on it. taken from their site:
FREE - 4 Oil Changes (A $127.88 value)
FREE - 1 Pair of Wiper Blades (Up to a $24.95 value)
50% OFF - BG Transmission Service (A $69.95 value)
50% OFF - State & Emission Inspection (A $21.50 value)
50% OFF - BG Inductions Service (A $69.95 value)
50% OFF - BG Power Steering Flush (A $51.92 value)
40% OFF - BG Colling System Service (A $39.20 value)
Save $40.00 Off Any Brake Repairs
Save $30.00 Off Any Exhaust System Repairs
vaburbia.com